{"record":{"id":"d25314c61f4ff68d","repo":"langflow-ai/langflow","slug":"cannot-build-deployment-artifact-the-parent-flow","errorCode":null,"errorMessage":"Cannot build deployment artifact: the parent flow for version '{flow_version.id}' has been deleted or has no name.","messagePattern":"Cannot build deployment artifact: the parent flow for version '(.+?)' has been deleted or has no name\\.","errorType":"http","errorClass":"HTTPException","httpStatus":422,"severity":"warning","filePath":"src/backend/base/langflow/api/v1/mappers/deployments/base.py","lineNumber":246,"sourceCode":"        *,\n        flow_version: FlowVersion,\n        flow_row: Flow | None,\n        deployment: Deployment,\n    ) -> BaseFlowArtifact:\n        \"\"\"Build a ``BaseFlowArtifact`` for a snapshot content update.\n\n        The base implementation assembles the artifact from the flow version\n        data and the parent flow's metadata.  Provider-specific mappers\n        override this to inject ``provider_data``.\n\n        Raises ``HTTPException(422)`` when the artifact cannot be built\n        (e.g. the parent flow has been deleted or the data is malformed).\n        \"\"\"\n        from pydantic import ValidationError\n\n        flow_name = getattr(flow_row, \"name\", None) or \"\"\n        if not flow_name:\n            raise HTTPException(\n                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,\n                detail=(\n                    f\"Cannot build deployment artifact: the parent flow for version \"\n                    f\"'{flow_version.id}' has been deleted or has no name.\"\n                ),\n            )\n        try:\n            return BaseFlowArtifact(\n                id=flow_version.flow_id,\n                name=flow_name,\n                description=getattr(flow_row, \"description\", None),\n                data=flow_version.data,\n            )\n        except ValidationError as exc:\n            raise HTTPException(\n                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,\n                detail=(\n                    f\"Flow version '{flow_version.id}' cannot be used as a deployment \"","sourceCodeStart":228,"sourceCodeEnd":264,"githubUrl":"https://github.com/langflow-ai/langflow/blob/976ec789d2886a86de109c044d089d68e96c9a35/src/backend/base/langflow/api/v1/mappers/deployments/base.py#L228-L264","documentation":"422 raised while building a deployment artifact in the base deployment mapper: the flow version's parent flow row is missing, deleted, or has an empty name, so a valid BaseFlowArtifact (which requires a non-empty name) cannot be constructed. Provider-specific mappers inherit this guard. The version row exists but points at a parent that cannot supply metadata.","triggerScenarios":"Creating/reading a deployment from a flow version whose parent flow was hard-deleted (version row left behind), or whose flow row has name='' — e.g. partial migrations or manual DB edits.","commonSituations":"Flow deleted while one of its versions was referenced by a deployment; DB restored inconsistently; name stripped by an import/export round-trip.","solutions":["Restore or recreate the parent flow, then re-attach the version","Delete the orphaned flow version row (or the deployment referencing it) and recreate the deployment from a healthy flow","Audit for other orphaned versions pointing at the missing flow id"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"flow = await get_flow(client, flow_version[\"flow_id\"])\nif not flow or not flow.get(\"name\"):\n    raise ValueError(\"parent flow missing/nameless — rebuild the version before deploying\")","typeGuard":null,"tryCatchPattern":"try:\n    artifact = await create_deployment(client, version_id)\nexcept httpx.HTTPStatusError as e:\n    if e.response.status_code == 422 and \"deleted or has no name\" in e.response.json()[\"detail\"]:\n        prune_orphaned_version(version_id)\n    raise","preventionTips":["Verify the parent flow still exists and is named before deploying any version","Cascade-delete or block deletion of flows that have versions referenced by deployments","Audit for orphaned flow_version rows after DB restores"],"tags":["deployment","flow-version","http-422","data-integrity","langflow"],"backgroundTag":null,"analyzedSha":"976ec789d2886a86de109c044d089d68e96c9a35","analyzedAt":"2026-08-14T18:23:12.227Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}